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In this equation, you first need to simplify the expression and get rid of parentheses.

You need to use the distributive property on the left side.

|dw:1443652798689:dw|

The first step in this equation is to simplify
-3(a - 6)
using the distributive property

|dw:1443652952295:dw|

|dw:1443653089656:dw|

That was just applying the distributive property.
Now we simplify -3(-6)
What is (-3) * (-6) = ?

18?

Correct, since negative times negative is positive.

|dw:1443653260886:dw|

3a^2?

|dw:1443653672095:dw|

Ok so far?

yes

Since nothing is being added to or subtracted from 6a, we just copy the 6a down.
What is 18 - 18 ?

|dw:1443653854679:dw|

Good.
What is -6 - 18?

-24

Correct.
We have:
|dw:1443654066983:dw|

subtract it by itself?

division

|dw:1443654727026:dw|

What is -24/6 ?

-4

and 6/6 is 1

Correct & correct.
We have:
|dw:1443655009021:dw|

The solution is
a = -4

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